State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Beijing 100083, China; School of the Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China.
State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Beijing 100083, China; School of the Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China.
Environ Pollut. 2018 Jun;237:1-9. doi: 10.1016/j.envpol.2018.02.029. Epub 2018 Feb 20.
In the background region of the Tibetan Plateau (TP), the rapid urbanization probably results in the massive generation of persistent organic pollutants (POPs), which lacks monitoring and evaluation. Since landfill could serve as an important sink of the locally used POPs, the analysis of POPs in the Tibetan landfill area might help us to understand the source composition and their transport in the TP. In this study, the concentration variations of polybrominated diphenyl ethers (PBDEs) in five soil profiles and seven surficial sediments around the largest Tibetan landfill were investigated. The total concentrations of PBDEs ranged from 128 to 1219 ng/kg in soils, and from 447 to 7295 ng/kg in sediments. The dominance of nona- and deca-BDEs possibly indicated the wide usage of deca-BDE as flame retardant in the TP. The vertical and spatial distribution patterns of PBDEs within soils plausibly revealed their main transport pathways by atmospheric dispersion and leachate seepage from landfill. Based on principal components analysis and multiple linear regression, these two pathways were estimated to account for 61% and 39% of the total concentrations, respectively. Additionally, the spatial and vertical distributions of octa-to deca-BDEs within soils were significantly influenced by soil particle size. Although the PBDEs inventory in the study area was comparatively low, the rapid urbanization in the TP might dramatically accelerate the PBDE emissions in the future. This study firstly introduced the presence of local PBDEs in the TP, and the inventory already influenced the surrounding environment. Once involved in the regional cycle of the TP, the local source of PBDEs from waste might significantly serve to raise background level resulting otherwise primarily from long-range atmospheric transport.
在青藏高原（TP）的背景区域，快速的城市化可能导致大量持久性有机污染物（POPs）的产生，而这些污染物缺乏监测和评估。由于垃圾填埋场可能是当地使用的 POPs 的一个重要汇，因此分析青藏高原的垃圾填埋场地区的 POPs 可能有助于我们了解其源组成及其在 TP 中的传输。在这项研究中，我们调查了最大的西藏垃圾填埋场周围五个土壤剖面和七个表层沉积物中多溴二苯醚（PBDEs）的浓度变化。土壤中 PBDEs 的总浓度范围为 128-1219ng/kg，沉积物中为 447-7295ng/kg。九溴和十溴代二苯醚的优势可能表明十溴代二苯醚作为阻燃剂在 TP 中的广泛使用。土壤中 PBDEs 的垂直和空间分布模式可能揭示了它们主要通过大气分散和垃圾渗滤液从垃圾填埋场渗漏的传输途径。基于主成分分析和多元线性回归，这两种途径分别估计占总浓度的 61%和 39%。此外，土壤中八溴至十溴代二苯醚的空间和垂直分布受到土壤颗粒大小的显著影响。尽管研究区域的 PBDEs 库存相对较低，但 TP 的快速城市化可能在未来会显著加速 PBDEs 的排放。本研究首次介绍了青藏高原本地 PBDEs 的存在，该库存已经影响了周围环境。一旦参与青藏高原的区域循环，来自废物的本地 PBDEs 源可能会显著提高背景水平，而背景水平主要来自远距离大气传输。
